What Old Testament prophet was the eunuch of Ethiopia reading from?

ANSWER

Isaiah (Esaias)

Acts 8 :

(26) Now an angel of the Lord said to Philip, “Go south to the road—the desert road—that goes down from Jerusalem to Gaza.” (27) So he started out, and on his way he met an Ethiopian eunuch, an important official in charge of all the treasury of the Kandake (which means “queen of the Ethiopians”). This man had gone to Jerusalem to worship, (28) and on his way home was sitting in his chariot reading the Book of Isaiah the prophet. (29) The Spirit told Philip, “Go to that chariot and stay near it.”
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